/*
 * Copyright 2002-2018 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.gitee.melin.bee.core.spring.orm.jpa;

import javax.persistence.EntityManager;
import org.springframework.lang.Nullable;
import org.springframework.orm.jpa.EntityManagerFactoryUtils;
import org.springframework.orm.jpa.JpaTransactionManager;
import org.springframework.transaction.SavepointManager;
import org.springframework.transaction.support.ResourceHolderSupport;
import org.springframework.util.Assert;

/**
 * Resource holder wrapping a JPA {@link EntityManager}.
 * {@link JpaTransactionManager} binds instances of this class to the thread,
 * for a given {@link javax.persistence.EntityManagerFactory}.
 *
 * <p>Also serves as a base class for {@link org.springframework.orm.hibernate5.SessionHolder},
 * as of 5.1.
 *
 * <p>Note: This is an SPI class, not intended to be used by applications.
 *
 * @author Juergen Hoeller
 * @since 2.0
 * @see JpaTransactionManager
 * @see EntityManagerFactoryUtils
 */
public class EntityManagerHolder extends ResourceHolderSupport {

    @Nullable
    private final EntityManager entityManager;

    private boolean transactionActive;

    @Nullable
    private SavepointManager savepointManager;

    public EntityManagerHolder(@Nullable EntityManager entityManager) {
        this.entityManager = entityManager;
    }

    public EntityManager getEntityManager() {
        Assert.state(this.entityManager != null, "No EntityManager available");
        return this.entityManager;
    }

    protected void setTransactionActive(boolean transactionActive) {
        this.transactionActive = transactionActive;
    }

    protected boolean isTransactionActive() {
        return this.transactionActive;
    }

    protected void setSavepointManager(@Nullable SavepointManager savepointManager) {
        this.savepointManager = savepointManager;
    }

    @Nullable
    protected SavepointManager getSavepointManager() {
        return this.savepointManager;
    }

    @Override
    public void clear() {
        super.clear();
        this.transactionActive = false;
        this.savepointManager = null;
    }
}
